; (function () {
    var Compute = function () { };
    Compute.prototype = {
        add: function (a, b) {
            return a + b;
        },
        sub: function (a, b) {
            return a - b;
        },
        mul: function () {
            return a * b
        },
        div: function () {
            return a / b
        }
    }
    window.Compute = Compute
})();
var compute = new Compute()
console.log(compute.add(1, 3));
